Thanks J_Rock! That chart makes it easy to follow. So if I follow the chart then my amp will be runnning at 1 ohm and the subs will be out of phase? By the way if my subs can handle 400W RMS each, how much power should I be running to them in this configuration. My understanding is that they need more power running this way.

[quote author=REDTHUNDER link=1142979181/0#3 date=1142977867]... So if I follow the chart then my amp will be runnning at 1 ohm and the subs will be out of phase? By the way if my subs can handle 400W RMS each, how much power should I be running to them in this configuration. My understanding is that they need more power running this way. [/quote]

The chart is correct for 1 ohm hook-up, clamshell. Just be careful using "out of phase" as an expression, because the drivers are out of phase ELECTRICALLY, but you are correcting that condition MECHANICALLY by turning one around and facing them together. In a clamshell arrangement the drivers have to work together as one unit. The only way to do that is to wire one of them electrically out of phase with the other.

I'm in danger of sounding like I'm nitpicking your semantics, but your drivers can't take much more power than their rating, although they do support each other against over excursion to some degree. If you read about needing more power in a clamshell arrangement, it's true, because by facing the drivers together, you have reduced your diaphram radiating area by half and lost 3dB of output as a result. So to get back to the same output in dB you need to double the power, but don't go too crazy and overpower your drivers. If your drivers are overpowered to the point of failure, it will most likely be heat that causes the failure in a clamshell loading.

So basically, a person needs to add the combined rms rating of the subs to determine the amount of power needed to run them? Is this true of this particular set up, or simply a general rule when powering multiple subs?

So if I were running three of these subs, lets say in a sealed enclosure, then I would need to run 1200W to them?

If I were to run single subs in two DBII's, the the power I would put to them would be the same as the isobaric configuration?

Thanks again for all the good informantion...I realize my ignorance is likely annoying, but I do appreaciate the education!